If you have forgotten some of the names of various polygons (or didn't know some of them in the first place) you can check this linkfor a quick review. 60 sides? How about 10,000 sides? It is another reference help given to us by the famous Wolfram group of mathematics investigators. The link was suggested by a grade 6 student.

What do you think the 5 angles of a 5 pointed star might add up to? Look below at Dr. James Tanton's idea.

Well, that's nice! How about a six pointed star? Seven? Eight? Now you doing real mathematical research!

Around 250 B.C. Archimedes, another old dead Greek guy, approximated the area of a circle. See hereto follow his thinking.

This website shows examples of superb creativity and logical follow-up by various Greeks in the B.C. era; Pythagoras, Eratosthenes, Euclid, and Archimedes, for example. They focused mainly on 2-D Plane Geometry matters (sometimes called Flatland), but Euclid did take an in-depth look at the Platonic Solids.